It's not me: it's you!
No, I'm not giving you my phone number nor my email. Your mobile is chock full of apps that harvest every bit of personal data they find in it and keep them to themselves to do who knows what, sell it to the best bidder and even do things I can't imagine. You may not care about your #privacy but I do care about mine. So, you are not getting my phone number even if you want to have my contact on #Signal.
Want to stay in touch? I can give you my #XMPP address though.